Recording speed-indicator.



No. 849,884. PATENTED APR. 9, 1907. R. P. BROWN. RECORDING SPEED INDICATOR.

. APPLICATION FILED PBB.13, 1905.

UNITED s'rArEs PATENT OFFICE.

RICHARD P. BROWN, OF PHILADELPHIA,PENNSYLVANIA.

RECORDING SPEED-INDICATOR. A

Specification of Letters Patent.

Pptented April 9, 1907.

Application filed February 13,1905. Serial No. 245,514,

in Recording Speed-Indicators, of which the following is a specification.

My invention relates to an improvement in speed-recording instruments in which a variation of s eed causes, by centrifugal force, a rise or fall of a column of liquid, preferably mercury, which movement is communicated by a float and a rod to a stylus, which is in operative contact with a chart moved by clockwork; and the object of my invention is to furnish an efiicient instrument of this nature with a minimum number of parts.

In the accompanying drawings, forming part of this specification and in which similar letters of reference indicate similar parts throughout the several views, Figure 1 is a front elevation, partly in section, of my recording speed-indicator; Fig. 2, a central vertical sectional view of the case inclosing the clockwork, chart, &c., and a side elevation of the styluscarrying arm, stylus, and connections.

A is a metal frame which carries the several parts of my machine.

B is a horizontal shaft carrying the pulley C, which is driven from the shaft of the engine, (not shown,) the revolutions or speed of which it is desired to indicate.

D is a bevel-gear carried by shaft B, which meshes with a bevel-gear E carried by a vertical shaft F.

G is a central tube or fluid-chamber carried by shaft F and connected to the reservoirs H by the bent tubes K. The connection between the central chamber G and the tubes K is a very small hole h, the pur ose of which is to prevent sudden fluctuations in the level of the mercury, which otherwisemight occur on the dead-centers of slowmoving engines.

The reservoirs H are so constructed that they may be secured eccentrically to the tubes K. Hence by rotating these reservoirs upon the tubes their centers maybe brought toward or away from the central reservoir G, and thus the centrifugal action for any given speed may be diminished or increased. When the machine 'is at rest, the stylus is normally at the zero-mark on the chart. When the chamber G and tubes K are rotated,

of dust.

the mercury falls in chamber G and rises in tube K. As the mercury falls in chamber G the float S, which rests upon the to of the mercur in this chamber, falls an draws .down t e rod V, which is carried by the float,

and the flexible spring-arm W, which carries the stylus, drawing the latter down across the face of the chart P, which is carried and rotated by a clock mechanism carried in a case N. The case N is inclosed in a box M, similar to boxes and for a like purpose in steamages, &c. The box M is secured to frame by the arm R.

The chart P is suitably graduated. In the drawings it is shown furnished with concentric circles representing each a speed of one hundred revolutions and with radial lines each representin an hour of the day. The pulley-wheel C, w ich is belted to or otherwise suitably driven from the engine, and the bevel-gears D E are so proportioned in relation to the chart P that a given number of revolutions of the driving-engine are, through the action of the mercury in the chamberS and tubes K, recorded u on the chart by the stylus; but as it is not a ways possible to .get the several parts in exactly the right proportion to obtain accurate results I have provided the reservoirs eccentrically secured to the tubes K. By turning these reservoirs in or out a wide variation in the movement of the mercury may be had for the same number of revolutions of the chamber G, the reservoirs acting to increase or decrease the width of the tubes K as they may be turned in or out.

The stylus-carry" g arm W is guided in its movements by the guide n.

T is a tube which is bolted to the box M and t a cap carried by the tube T, which covers the top of the chamber G and extends down along the sides thereof to prevent the access In the tube T or cup t is a guide it for the rod V. I

The line X X represents the normal level of-the mercury in the chamber G and tubes K.

k is a plugged orifice through which the mercury may be drawn off when desired.

Having thus described my invention, I claim as new and desire to secure by Letters Patent In a recording speed-indicator, in combination, a frame having bearings for a horizontal and a vertical shaft, said shafts, connections for said shafts, a central rotating fluidchamber having a contracted opening therein IIO carried by the vertical shaft, op ositely-arstylus, and an arm carried by said shaft-car- [O ranged hollow arms the lower en s of which rying frame for carrying said clock mechanconnnunlcute wlth the mud-chamber, eccen- 1sn1 and connected parts.

t-ricully-adjustable reservoirs carried by the t In testimony whereof I. affix my signature upper ends of sand arms, & float earned 1n l 1n presence 01 two wltnesses.

said central fluid-chamber, a rod carried by RICHARD P. BROWN said Hunt, at flexible stylus-arm adjustably Witnesses:

connected to the rod, a stylus, a clock-oper- JOHN F. GRANT,

ated chart adapted to be engaged by said J. FRED DE HART. 

